<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8>
    <meta name="viewport" content="width=device-width, initial-scale=1.e">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>v-show指令</title>
</head>

<body>
    <div id="app">
        <input type="button" value="切换显示状态" @click="changeIsShow" /><br/>
        <img src="./img/monkey.gif" alt="" v-show="isShow" /><br/>
        <br/>
        <span>当前年龄：{{ age }}</span><br/>
        <input type="button" value="累加年龄" @click="addAge" />
        <input type="button" value="递减年龄" @click="subAge" /><br/>
        <img src="./img/monkey.gif" alt="" v-show="age>=18" />
    </div>
    
    <!-- 开发环境版本，包含了有帮助的命令行警告 -->
    <!--<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>-->
    <script src="./js/utils/vue.js"></script>
    <script>
        var app = new Vue({
            el: "#app",
            data: {
                isShow: false,
                age: 17
            },
            methods: {
                changeIsShow: function () {
                    this.isShow = !this.isShow;
                },
                addAge: function () {
                    this.age++;
                },
                subAge: function () {
                    this.age--;
                }
            }
        })
    </script>
</body>
</html>